diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 26919279..1edf01e5 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -42,6 +42,7 @@ Version 2.9.2
 - WBW: Switch RC/SC Z180 platforms to 115,200 default baud rate
 - PMS: Enhanced PPIDE driver to handle multiple PPI interfaces
 - PMS: Added a ROM based game
+- WBW: Only assign drive letters to hard disk devices with media
 
 Version 2.9.1
 -------------
diff --git a/ReadMe.txt b/ReadMe.txt
index f9f522d0..ecfc0831 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -7,7 +7,7 @@
 ***********************************************************************
 
 Wayne Warthen (wwarthen@gmail.com)
-Version 2.9.2-pre.28, 2020-02-07
+Version 2.9.2-pre.29, 2020-02-08
 https://www.retrobrewcomputers.org/
 
 RomWBW is a ROM-based implementation of CP/M-80 2.2 and Z-System for 
diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index 971d3690..b0ae7c29 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -302,7 +302,7 @@ BOOT:
 	LD	SP,STACK	; STACK FOR INITIALIZATION
 
 ;
-	; COPY INITIALIZATION CODE TO RUNNINT LOCATION $8000
+	; COPY INITIALIZATION CODE TO RUNNING LOCATION $8000
 	LD	HL,BUFPOOL
 	LD	DE,$8000
 	LD	BC,CBIOS_END - BUFPOOL
@@ -2014,7 +2014,7 @@ AUTOSUB:
 	INC	A			; CHECK FOR ERR, $FF --> $00
 	RET	Z			; ERR, DO NOT ATTEMPT AUTO SUBMIT
 ;
-	LD	HL,CMD			; ADDRESS OF STARTUP COMMAND
+	LD	HL,CMD			; ADDRESS OF STARTUP COMMANDs
 	LD	DE,CCP_LOC + 7		; START OF COMMAND BUFFER IN CCP
 	LD	BC,CMDLEN		; LENGTH OF AUTOSTART COMMAND
 	LDIR				; PATCH COMMAND LINE INTO CCP
@@ -2398,7 +2398,11 @@ DRV_INIT:
 	LD	(DRVMAPADR),HL		; SAVE AS DRVMAP ADDRESS
 	LD	(HEAPTOP),HL		; AND AS NEW HEAP TOP
 ;
-	; SETUP TO LOOP THROUGH AVAILABLE DEVICES
+	; SETUP TO LOOP THROUGH AVAILABLE DEVICES BUILDING LIST OF
+	; ACTIVE UNITS AND COUNTING NUMBER OF ACTIVE HARD DISK
+	; DEVICES.  NON-HARD DISK UNITS ARE ALWAYS CONSIDERED
+	; ACTIVE, BUT HARD DISK UNITS ARE ONLY CONSIDERED ACTIVE
+	; IF THERE IS MEDIA IN THE DRIVE.
 	LD	B,BF_SYSGET
 	LD	C,BF_SYSGET_DIOCNT
 	RST	08			; E := DISK UNIT COUNT
@@ -2408,31 +2412,76 @@ DRV_INIT:
 	RET	Z			; HANDLE ZERO DEVICES (ALBEIT POORLY)
 ;
 	; LOOP THRU DEVICES TO COUNT TOTAL HARD DISK VOLUMES
-	PUSH	BC			; SAVE THE DEVICE COUNT
-	LD	C,0			; USE C AS DEVICE LIST INDEX
-	LD	E,0			; INIT E FOR HARD DISK VOLUME COUNT
+	LD	C,0			; INIT C AS DEVICE LIST INDEX
+	LD	D,0			; INIT D AS TOTAL DEVICE COUNT
+	LD	E,0			; INIT E FOR HARD DISK DEVICE COUNT
+	LD	HL,DRVLST		; INIT HL PTR TO DRIVE LIST
 ;
 DRV_INIT2:
-	PUSH	BC			; SAVE LOOP CONTROL
 	CALL	DRV_INIT3		; CHECK DRIVE
-	POP	BC			; RESTORE LOOP CONTROL
 	INC	C			; NEXT UNIT
 	DJNZ	DRV_INIT2		; LOOP
-	POP	BC			; RESTORE UNIT COUNT IN B
+	LD	A,D			; TOTAL DEVICE COUNT TO D
+	LD	(DRVLSTC),A		; SAVE THE COUNT
 	JR	DRV_INIT4		; CONTINUE
 ;
 DRV_INIT3:
 	PUSH	DE			; SAVE DE (HARD DISK VOLUME COUNTER)
+	PUSH	HL			; SAVE DRIVE LIST PTR
+	PUSH	BC			; SAVE LOOP CONTROL
 	LD	B,BF_DIODEVICE		; HBIOS FUNC: REPORT DEVICE INFO
 	RST	08			; CALL HBIOS, UNIT TO C
 	LD	A,D			; DEVICE TYPE TO A
+	POP	BC			; RESTORE LOOP CONTROL
+	POP	HL			; RESTORE DRIVE LIST PTR
 	POP	DE			; RESTORE DE
 	CP	DIODEV_IDE		; HARD DISK DEVICE?
-	RET	C			; NOPE, RETURN
+	JR	NC,DRV_INIT3A		; IF SO, HANDLE SPECIAL
+	LD	(HL),C			; SAVE UNIT NUM IN LIST
+	INC	HL			; BUMP PTR
+	INC	D			; INC TOTAL DEVICE COUNT
+	RET
+;
+DRV_INIT3A:
+	; CHECK FOR ACTIVE AND RETURN IF NOT
+	PUSH	DE			; SAVE DE (HARD DISK VOLUME COUNTER)
+	PUSH	HL			; SAVE DRIVE LIST PTR
+	PUSH	BC			; SAVE LOOP CONTROL
+	
+	LD	B,BF_DIOMEDIA		; HBIOS FUNC: SENSE MEDIA
+	LD	E,1			; PERFORM MEDIA DISCOVERY
+	RST	08
+
+	POP	BC			; RESTORE LOOP CONTROL
+	POP	HL			; RESTORE DRIVE LIST PTR
+	POP	DE			; RESTORE DE
+	
+	RET	NZ			; IF NO MEDIA, JUST RETURN
+	
+	; IF ACTIVE...
+	LD	(HL),C			; SAVE UNIT NUM IN LIST
+	INC	HL			; BUMP PTR
+	INC	D			; INC TOTAL DEVICE COUNT
 	INC	E			; INCREMENT HARD DISK COUNT
 	RET				; AND RETURN
 ;
 DRV_INIT4:	; SET SLICES PER VOLUME (HDSPV) BASED ON HARD DISK VOLUME COUNT
+
+;	; *** DEBUG ***
+;	CALL	NEWLINE2
+;	LD	A,(DRVLSTC)
+;	LD	B,A
+;	CALL	PRTHEXBYTE
+;	LD	A,' '
+;	CALL	COUT
+;	LD	HL,DRVLST
+;TEMP1:
+;	LD	A,(HL)
+;	INC	HL
+;	CALL	PRTHEXBYTE
+;	DJNZ	TEMP1
+;	; *** DEBUG ***
+
 	LD	A,E			; HARD DISK VOLUME COUNT TO A
 	LD	E,8			; ASSUME 8 SLICES PER VOLUME
 	DEC	A			; DEC ACCUM TO CHECK FOR COUNT = 1
@@ -2446,14 +2495,20 @@ DRV_INIT5:
 	LD	A,E			; SLICES PER VOLUME VALUE TO ACCUM
 	LD	(HDSPV),A		; SAVE IT
 ;
-	; SETUP TO ENUMERATE DEVICES TO BUILD DRVMAP
-	LD	B,BF_SYSGET
-	LD	C,BF_SYSGET_DIOCNT
-	RST	08			; E := DISK UNIT COUNT
-	LD	B,E			; COUNT TO B
-	LD	C,0			; USE C AS DEVICE LIST INDEX
+;	; SETUP TO ENUMERATE DEVICES TO BUILD DRVMAP
+;	LD	B,BF_SYSGET
+;	LD	C,BF_SYSGET_DIOCNT
+;	RST	08			; E := DISK UNIT COUNT
+;	LD	B,E			; COUNT TO B
+;	LD	C,0			; USE C AS DEVICE LIST INDEX
+;
+	LD	A,(DRVLSTC)		; ACTIVE DRIVE LIST COUNT TO ACCUM
+	LD	B,A			; ... AND MOVE TO B FOR LOOP COUNTER
+	LD	HL,DRVLST		; HL IS PTR TO ACTIVE DRIVE LIST
 ;
 DRV_INIT6:	; LOOP THRU ALL UNITS AVAILABLE
+	PUSH	HL			; PRESERVE DRIVE LIST PTR
+	LD	C,(HL)			; GET UNIT NUM FROM LIST
 	PUSH	BC			; PRESERVE LOOP CONTROL
 	LD	B,BF_DIODEVICE		; HBIOS FUNC: REPORT DEVICE INFO
 	RST	08			; CALL HBIOS, D := DEVICE TYPE
@@ -2462,6 +2517,8 @@ DRV_INIT6:	; LOOP THRU ALL UNITS AVAILABLE
 	CALL	DRV_INIT7		; MAKE DRIVE MAP ENTRY(S)
 	POP	BC			; RESTORE LOOP CONTROL
 	INC	C			; INCREMENT LIST INDEX
+	POP	HL			; RESTORE DRIVE LIST PTR
+	INC	HL			; INCREMENT ACTIVE DRIVE LIST PTR
 	DJNZ	DRV_INIT6		; LOOP AS NEEDED
 	RET				; FINISHED
 ;
@@ -2880,6 +2937,8 @@ HEAPTOP	.DW	BUFPOOL			; CURRENT TOP OF HEAP
 BOOTVOL	.DW	0			; BOOT VOLUME, MSB=BOOT UNIT, LSB=BOOT SLICE
 BNKRAMD	.DB	0			; STARTING BANK ID FOR RAM DRIVE
 HDSPV	.DB	2			; SLICES PER VOLUME FOR HARD DISKS (MUST BE >= 1)
+DRVLST	.FILL	32			; ACTIVE DRIVE LIST USED DURINT DRV_INIT
+DRVLSTC	.DB	0			; ENTRY COUNT FOR ACTIVE DRIVE LIST
 ;
 CMD	.DB	CMDLEN - 2
 	.TEXT	"SUBMIT PROFILE"
diff --git a/Source/CBIOS/ver.inc b/Source/CBIOS/ver.inc
index ed995cd7..b65ec245 100644
--- a/Source/CBIOS/ver.inc
+++ b/Source/CBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.28"
+#DEFINE BIOSVER	"2.9.2-pre.29"
diff --git a/Source/CPM22/ver.inc b/Source/CPM22/ver.inc
index ed995cd7..b65ec245 100644
--- a/Source/CPM22/ver.inc
+++ b/Source/CPM22/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.28"
+#DEFINE BIOSVER	"2.9.2-pre.29"
diff --git a/Source/CPM3/ver.inc b/Source/CPM3/ver.inc
index 0b96de4f..2fc0ccc8 100644
--- a/Source/CPM3/ver.inc
+++ b/Source/CPM3/ver.inc
@@ -3,5 +3,5 @@ rmn	equ	9
 rup	equ	2
 rtp	equ	0
 biosver	macro
-	db	"2.9.2-pre.28"
+	db	"2.9.2-pre.29"
 	endm
diff --git a/Source/HBIOS/Build.ps1 b/Source/HBIOS/Build.ps1
index 1572af95..1e653395 100644
--- a/Source/HBIOS/Build.ps1
+++ b/Source/HBIOS/Build.ps1
@@ -140,7 +140,7 @@ Function Concat($InputFileList, $OutputFile)
 
 #
 # Since TASM has no mechanism to include files dynamically based on variables, a file
-# if built on-the-fly here for imbedding in the build process.  This file is basically
+# is built on-the-fly here for imbedding in the build process.  This file is basically
 # just used to include the platform and config files.  It also passes in some values
 # from the build to include in the build.
 
diff --git a/Source/HBIOS/ppide.asm b/Source/HBIOS/ppide.asm
index 98dfd096..fc964390 100644
--- a/Source/HBIOS/ppide.asm
+++ b/Source/HBIOS/ppide.asm
@@ -990,14 +990,17 @@ PPIDE_RESET:
 	LD	DE,150000/16		; ~???MS
 	CALL	VDELAY
 ;
-	CALL	PPIDE_INITUNIT		; INIT CURRENT UNIT
+	; INITIALIZE THE INDIVIDUAL UNITS (MASTER AND SLAVE).
+	; BASED ON TESTING, IT APPEARS THAT THE MASTER UNIT MUST
+	; BE DONE FIRST OR THIS BEHAVES BADLY.
 	PUSH	IY			; SAVE CFG PTR
-	CALL	PPIDE_GOPARTNER		; POINT TO PARTNER
+	BIT	0,(IY+PPIDE_ACC)	; MASTER?
+	CALL	Z,PPIDE_GOPARTNER	; IF NOT, SWITCH TO MASTER
+	CALL	PPIDE_INITUNIT		; INIT CURRENT UNIT
+	CALL	PPIDE_GOPARTNER		; POINT TO SLAVE
 	CALL	PPIDE_INITUNIT		; INIT PARTNER UNIT
 	POP	IY			; RECOVER ORIG CFG PTR
-;
 	RET
-
 ;
 ;
 ;
diff --git a/Source/HBIOS/ver.inc b/Source/HBIOS/ver.inc
index ed995cd7..b65ec245 100644
--- a/Source/HBIOS/ver.inc
+++ b/Source/HBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.28"
+#DEFINE BIOSVER	"2.9.2-pre.29"
diff --git a/Source/ZSDOS/ver.inc b/Source/ZSDOS/ver.inc
index ed995cd7..b65ec245 100644
--- a/Source/ZSDOS/ver.inc
+++ b/Source/ZSDOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.28"
+#DEFINE BIOSVER	"2.9.2-pre.29"